laravel ubuntu下安装的报错解决

系统环境为：PHP 7.0.13-0 + ubuntu0.16.04.1 (cli) 

1. 如果laravel new my_app 创建新项目失败报错

[RuntimeException]
The Zip PHP extension is not installed. Please install it and try again.

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解决办法安装sudo apt-get install php7.0-zip 
2. laravel/framework v5.2.18 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system。 
解决办法执行sudo apt-get install php7.0-mbstring 
不需要更改 php.ini 文件。

3.phpunit/phpunit 4.0.2 requires ext-dom * -> the requested PHP extension dom is missing from your system. 
解决办法执行sudo apt-get install php-xml

4.PDOException: could not find driver 
解决办法执行sudo apt-get -y install php-mysql